... 关键词: 曝气生物滤池; 轻质滤料; 升级改造 [gap=667]Key words: biological aerated filter;light filtering material; upgrading reconstruction ...
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A light soil consisting of siliceous diatom remains and often used as a filtering material.
由硅藻土残留物的通常用来作为过滤材料的轻质土。
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